Vue Language Features
⚡ Fast Vue Language Support Extension
Plugin's page on Visual Studio Marketplace
VueLF is a Language Support plugin built specifically for Vue 3. It's based on @vue/reactivity to calculate everything on-demand, to implement native TypeScript language service level performance.
[Tips]
Quick Start
Usage
Setup for Vue 2
- Add
@vue/runtime-dom
This extension requires Vue 3 types from the @vue/runtime-dom.
Vue 3 itself includes the @vue/runtime-dom package. For Vue 2 you will have to install it yourself:
// package.json
{
"devDependencies": {
"@vue/runtime-dom": "latest"
}
}
- Remove
Vue.extend
Template type-checking is not supported with Vue.extend. You can use composition-api, vue-class-component, or export default { ... } instead of export default Vue.extend.
Here is a compatibility table for different ways of writing the script blocks:
|
Component options type-checking in <script> |
Interpolation type-checking in <template> |
Cross-component props type-checking |
export default { ... } with JS |
Not supported |
Not supported |
Not supported |
export default { ... } with TS |
Not supported |
Supported but deprecated |
Supported but deprecated |
export default Vue.extend({ ... }) with JS |
Not supported |
Not supported |
Not supported |
export default Vue.extend({ ... }) with TS |
Limited (supports data types but not props types) |
Limited |
Not supported |
export default defineComponent({ ... }) |
Supported |
Supported |
Supported |
| Class component |
Supported |
Supported with additional code (#21) |
Supported with additional code |
Note that you can use defineComponent even for components that are using the Options API.
- Support for Vue 2 template
Volar preferentially supports Vue 3. Vue 3 and Vue 2 templates have some differences. You need to set the experimentalCompatMode option to support the Vue 2 templates.
// tsconfig.json
{
"compilerOptions": {
// ...
},
"vueCompilerOptions": {
"experimentalCompatMode": 2,
"experimentalTemplateCompilerOptions": {
"compatConfig": { "MODE": 2 } // optional
}
}
}
- remove
.d.ts files if they exist.
For projects generated by the Vue CLI, .d.ts files are included. Remove these files.
rm src/shims-tsx.d.ts src/shims-vue.d.ts
Define Global Components
PR: https://github.com/vuejs/vue-next/pull/3399
Local components, Built-in components, native HTML elements Type-Checking is available with no configuration.
For Global components, you need to define GlobalComponents interface, for example:
// components.d.ts
declare module '@vue/runtime-core' {
export interface GlobalComponents {
RouterLink: typeof import('vue-router')['RouterLink']
RouterView: typeof import('vue-router')['RouterView']
}
}
export {}
Notes
Vetur
You need to disable Vetur to avoid conflicts.
Recommended use css / less / scss as <style> language, because these base on vscode-css-languageservice to provide reliable language support.
If use postcss / stylus / sass, you need to install additional extension for syntax highlighting. I tried these and it works, you can also choose others.
Volar does not include ESLint and Prettier, but the official ESLint and Prettier extensions support Vue, so you could install these yourself if needed.
If using Vetur's Customizable Scaffold Snippets, recommend use Snippet Generator convert to VSCode Snippets. There are also snippets on the VSCode Marketplace, such as Sarah Drasner's Vue VSCode Snippets, if you prefer ready-made snippets without customization.
If VSCode gives an error for class and slot like this:
This is because one of the packages installed in your project uses @types/react which breaks some parts of Volar.
Please see the following solutions:
Recursive components
Volar can't typecheck recursive components out of the box due to TS limitation.
But there's a workaround, you can explicitly specify component's props like so:
Bar.vue
<template>
<Bar :a="'wrong'" />
</template>
<script setup lang="ts">
import { defineAsyncComponent, type DefineComponent } from 'vue'
interface Props {
a: number
}
const Bar = defineAsyncComponent<DefineComponent<Props>>(
() => import('./Bar.vue') as any
)
defineProps<Props>()
</script>
Credits
